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Development of advanced nanostructured ferromagnetic materials on the basis of iron powders

Keywords:

A.A. Shepelev – Ph. D. (Eng.), Head of Laboratory, JSC «EMC of «VEGA» Concern». E-mail: al.shep@mail.ru
A.V. Bocharov – Ph. D. (Eng.), Head of Laboratory, JSC «EMC of «VEGA» Concern». E-mail: imcv@yandex.ru
E.A. Vlasenko – Research Scientist, JSC «EMC of «VEGA» Concern». E-mail: imcv@yandex.ru
A.L. Pomadchik – Research Scientist, National University of Science and Technology «MISIS»; JSC «EMC of «VEGA» Concern». E-mail: pom17@yandex.ru
A.A. Semenov – Ph. D. (Eng.), Head of Department, JSC «EMC of «VEGA» Concern». E-mail: semenov@imc-vega.ru


Nanostructured fine powders are widely used in composite materials and coatings applied for production of radiowave and microwave bands absorbing components, used for high-power electromagnetic radiation (EMR) biological shielding, equipment for shielded rooms and anechoic rooms, for resolving problems of noise immunity and electromagnetic compatibility of electronic devices, reducing of radar visibility of various objects, radio equipment and other common and special devices, engineered and produced at. Development of modern radio engineering and electronics (first of all microwave engineering) continuously boosts demand for ferromagnetics appropriate for wider application and property ranges. For achievement of these goals scientific research and development works are carried out at ЕМС «Vega» Corp., which consists in composition and structure modification of comparatively cheap carbonyl iron powders. Modification of iron powders at our enterprise is realised with the help of mechanochemical treatment (MCT) in high-energy attritor or planetary mills. MCT allow effective increasing ferromagnetic powder dispersion and alloying iron with other elements, changing its chemical and phase composition. As a result such essential properties as magnetic permeability (µ), dielectric permeability (ε), resonant frequencies spectra, dimensional weight and strength properties, some other properties of final products changes in wide range. MCT process is based on high energy impact of milling bodies with particles leading to deformation, fracture, welding of latter due to locally (area radius about 10 nm and less) high mechanical stresses and temperature (up to 500 °C and higher) exposition for a very short periods of time (less than 10-3 sec). Further alloying continues due to diffusion mechanism.
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